thomson



(No Model.)

J. THOMSON.

INTERMITTING CIRCULAR FEED MOTION.

No. 360,740. Patented Apr. 5, I887.

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vented from displacement by the clip 14, se-v plngs-that is, onebearing-plug and one foland disk is the drawing-lever 9, having twoUNITED STATES PATENT OFFICE.

JOHN THOMSON, OF BROOKLYN, N. Y., ASSIGNOR TO THE COLTS PATENT FIRE ARMSMANUFACTURING COMPANY, OF HARTFORD, CONN.

INTERMITTING CIRCULAR FEED-MOTION.

SPECIFICATION forming part of Letters Application filed June 8, 1886.

Patent NO. 360,740, dated April 5, 1887.

Serial No. 201,524. (No model.)

To all whom it may concern.-

Be it known that I, JOHN THOMSON, a citizen of the United States,residing in the city of Brooklyn, Kings county, State of New York, haveinvented certain new and useful Improvements in Intermitting CircularFeed- ?flotions, of which the following is a specificaion.

This invention relates to mechanical movements; and the object thereofis to impart intermitting or step-by-step circular motion by means ofthe reciprocating vibratory action of a lever.

In the drawings, Figure 1 is a front elevation, and Figs. 2 and 3 sideelevation and plan, illustrating my invention. Fig. 4 is a detached Viewin partial section of the drivinglever and its parts, and Fig. 5 is afront elevation showing modifications to illustrate the principlesinvolved.

The construction, operation, and advaniages derived therefrom arejointly and severally pointed out as follows:

The number ,6 refers to a flange formed on the disk 7, the latter havinga hub or bearing, 8, upon which the disk may be adapted to revolve inany suitable manner; or the disk may be part of a shaft, wheel, orapparatus to which step-bystep motion is desired to be imparted. Passingentirely across the flange jaws, 1O 11, adapted to engage the flangeinside and outside. The space formed by and between the jawsispreferably at a right angle to the center of the lever, as indicated bycenter lines, 12 13, and is sufficiently wide to freely engage theflange. The lever is precured by the screw 15 to the lever-jaw 10, theclip projecting under the disk on the opposite side from the flange, butpermitting free circular action of either the disk or the lever. Thelever has a boss, 16, which projects down to the face of the disk on theflange side of the disk, and radiating from the boss at right angles tothe lever are two arms, 17 18. These arms are bored to form cylinders,in which are arranged the outer bearing-plugs, 19, the inner followers,20, and between each pair of loweris interposed a light spiral spring,21,

the springs acting by extension. The boss is bored through at 22, andcounterbored, as at 23, on the lower orinner side, forming thereby arecessed bearing for the cam 24. The cam projects out through the frontoft-he lever, having a head or button, 25, for manually changing itsposition. The object of the recess is to preventthe accidentalwithdrawal of the cam. Now, by properly turning the cam, (see Fig. 4,)these conditions are produced with respect to the drivinglever, thejaws, and the flangez-In the position shown one spring is compressed andthe other partly or entirely relaxed; hence, therefore, thelever isforced over until the lost motion in the jaws is taken up by the contactof the jaws upon the inner and outer surfaces of the flange. A halfturnof the cam would reverse the position of thelever-that is, the centerline, 26, of the lever would be carried over to the opposite side of thecenter line, 27, of the disk-while a quarter-turn of the cam in eitherdirection would compress the relaxed spring, so that both springs wouldbe under equal tension, in which instance the lines 26- 27 coincide andthere is practically no con-. tact between the jaws and the flange.

In the position indicated in Figs. 1, 2, and 3 of the drawings it willbe seen that upon ap- 8o plying force to the lever at 28 in thedirection of arrow '29 the transmission of the force is directly to theinner edge, 30, of the jaw and the inner side, 31, of the flange, theresistance to the dynamic effect of said force being from the edge 30 tothe contact 32 between the outer surface, 33, of the flange and theinner surface of the outerjaw, 10. The consequence of this is that thelever is clamped to the disk as if both were one part, wherefore thedisk is 0 caused to rotate in the direction of arrow 34:. In this actionthe limitation to the drivingpower of the lever is the strength of thejaws and the flange to resist torsion or to crumble, and is irrespectiveof friction, the effect being 5 due entirely to the manner of applyingthe initial force, and is mathematically demonstrated by the resultantangle 35 of the lines 36 37, in whichis presented the apparent anomalyof force acting in a direction opposite 10o to its dynamic effect. Theproof of this lies in the reverse action of the lever, which, if

unobstructed, would simply take up the lost motion of the jaws and drivethe disk as before, but in the opposite direction. Herein appears thefunction of the springs,which act to keep the jaws in constant contact.Thus, when the force at 28 is reversed in adirection opposite to thearrow, the transmission is first by line 38 to the contact-point 39 ofplug 19, and by line 40 to present resistance-point 32, whence the leversimply slides freely without driving the disk. By reversing the actionof the cam and the springs the driving action of the lever would bereversed. By turning the cam to equally compress both springs the jawswould be neutral to the flange, and henee'not drive in either direction.

An important contingent advantage of this construction is that the feedof the disk can be reduced to infinitesimal degreesin con sequence ofthe faces of the jaws being held to absolute contact with the flangeduring the reverse or idle motion of the lever, thereby entirelyeliminating lost motion.

In Fig. 5 an arrangement is shown of the lever when desired to drive inone direction only without discontinuance, consisting of the simpletongue-spring 41, acting between the flange and the lever to hold thejaws properly in contact; but for all purposes it is not essential thata spring or springs be used, as a simple plug or pin, as 47, will givesatisfactory results. This figure furthermore demonstrates by comparisonthe advantage-of first transmitting the initial force to the edge of thedisk opposite to the application of the force.

It will be seen that if force be applied at 42, which is the usual modeof application in silent feeds, nipping-levers, frictionratchets, 820.,the transmission is first by line 43 to point of contact 44, thence byline 45 to point of resistance 46, the direction of the applied forcebeing in a like direction with the desired motion of the disk. Hence, ifthe resistance of the disk against rotation is greater than the frictiondeveloped between the points 44 46, thejaws will slip upon the flange.

The device as herein represented may be constructed quite as cheaply asthe usual ratchet-and-pawl arrangements, while it is more durable,silent in operation, may be readily disengaged, or instantly changed tofeed in either direction. It is particularly applicable to thefeed-motion of planers, windingrolls, ink-fountains of printing-presses,and analogous purposes. 4

The contact-surfaces of the flange and jaws should be finished smoothand true. It is not necessary that the driving-face of the jaw be sharp,as shown in the drawings, as a broad surface contact will act equallywell, and for severe duty would be preferable.

I olaim- 1. The combination of a flanged disk and a driving-lever havingjaws adapted to engage the flange, and means, substantially asdescribed, for holding the jaws in proper relation to the flange, theadaptation and arrangement being such that the driving-power is appliedto the lever on the opposite side of the disk from that of theengagement of the jaws, substantially as described.

2. In combination, the flanged disk, the driving-lever havingjawsadapted to engage the flange, and a spring or springs arranged to holdthe said lever and jaws in proper relation to the flange, for thepurpose specified.

3. The combination, with the flanged disk and driving-lever having jaws,of the radial arms having springs and sliding'plugs, and a cam arrangedto act upon said springs, in the manner and for the purpose herein setforth.

4. The combination of the flanged disk and a driving-lever having jawsembracing the flange, the arrangement being such that force applied atthe end of thelever is directly transmitted to the inner side of theflange, substantially as described.

5. The combination of the flanged disk and a driving-lever having jawsembracing the flange on one side of the center of the disk, thedriving-arm of the lever extending over the flange on the opposite sideof the center, the force being transmitted directly to the inner side ofthe flange, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' JOHN THOMSON.

Witnesses:

\VILLIAM THOMSON, OLIvER N. PAYNE.

